A flaw was found in Netty. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAX_VALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYN_STREAM frames with FLAG_FIN=0, causing unbounded heap and direct memory allocation that can lead to JVM OutOfMemoryError and a denial of service.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Io.netty
  • Netty-codec-http
Redhat
  • Amq Broker
  • Amq Clients
  • Apache Camel Quarkus
  • Apicurio Registry
  • Build Keycloak
  • Build Of Apache Camel For Quarkus
  • Build Of Apache Camel For Spring Boot
  • Build Of Apicurio Registry
  • Build Of Debezium 3
  • Build Of Keycloak
  • Build Of Quarkus
  • Camel Quarkus
  • Camel Spring Boot
  • Data Grid 8
  • Debezium
  • Fuse 7
  • Jboss Data Grid
  • Jboss Enterprise Application Platform
  • Jboss Fuse
  • Quarkus
  • Red Hat Single Sign On
  • Single Sign-on

No data.

No data.

References
Link Providers
https://access.redhat.com/errata/RHSA-2026:69440 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:69470 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:70257 cve-icon cve-icon
https://access.redhat.com/errata/RHSA-2026:83612 cve-icon cve-icon
https://access.redhat.com/security/cve/CVE-2026-93488 cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2536887 cve-icon cve-icon
https://github.com/netty/netty/releases/tag/netty-4.1.138.Final cve-icon cve-icon cve-icon
https://github.com/netty/netty/releases/tag/netty-4.2.18.Final cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-93488 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-93488 cve-icon
History

Thu, 15 Oct 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:debezium:3 cpe:/a:redhat:debezium:3.6
References

Fri, 09 Oct 2026 23:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat apache Camel Quarkus
Redhat quarkus
CPEs cpe:/a:redhat:apache_camel_quarkus:3.33
cpe:/a:redhat:quarkus:3.27::el8
cpe:/a:redhat:quarkus:3.33::el8
Vendors & Products Redhat apache Camel Quarkus
Redhat quarkus

Tue, 22 Sep 2026 22:30:00 +0000

Type Values Removed Values Added
References

Mon, 21 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Io.netty
Io.netty netty-codec-http
Redhat build Of Apache Camel For Quarkus
Redhat build Of Apache Camel For Spring Boot
Redhat build Of Apicurio Registry
Redhat build Of Debezium 3
Redhat build Of Keycloak
Redhat build Of Quarkus
Redhat data Grid 8
Redhat fuse 7
Redhat single Sign-on
Vendors & Products Io.netty
Io.netty netty-codec-http
Redhat build Of Apache Camel For Quarkus
Redhat build Of Apache Camel For Spring Boot
Redhat build Of Apicurio Registry
Redhat build Of Debezium 3
Redhat build Of Keycloak
Redhat build Of Quarkus
Redhat data Grid 8
Redhat fuse 7
Redhat single Sign-on

Mon, 21 Sep 2026 17:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:quarkus:3
Vendors & Products Redhat quarkus
References

Sat, 19 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 18 Sep 2026 12:00:00 +0000

Type Values Removed Values Added
Description A flaw was found in Netty. SpdySessionHandler accepts an unlimited number of concurrent remote-initiated streams because localConcurrentStreams defaults to Integer.MAX_VALUE and the handler provides no API to change it. A remote peer can open a SPDY connection and send a large number of SYN_STREAM frames with FLAG_FIN=0, causing unbounded heap and direct memory allocation that can lead to JVM OutOfMemoryError and a denial of service.
Title Io.netty/netty-codec-http: netty: denial of service via unbounded concurrent spdy streams
First Time appeared Redhat
Redhat amq Broker
Redhat amq Clients
Redhat apicurio Registry
Redhat build Keycloak
Redhat camel Quarkus
Redhat camel Spring Boot
Redhat debezium
Redhat jboss Data Grid
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat quarkus
Redhat red Hat Single Sign On
Weaknesses CWE-770
CPEs cpe:/a:redhat:amq_broker:7
cpe:/a:redhat:amq_clients:2023
cpe:/a:redhat:apicurio_registry:3
cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:camel_quarkus:3
cpe:/a:redhat:camel_spring_boot:4
cpe:/a:redhat:debezium:3
cpe:/a:redhat:jboss_data_grid:8
cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jboss_fuse:7
cpe:/a:redhat:quarkus:3
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat amq Broker
Redhat amq Clients
Redhat apicurio Registry
Redhat build Keycloak
Redhat camel Quarkus
Redhat camel Spring Boot
Redhat debezium
Redhat jboss Data Grid
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat quarkus
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-09-18T11:47:52.574Z

Updated: 2026-10-15T16:42:26.266Z

Reserved: 2026-09-18T06:32:38.574Z

Link: CVE-2026-93488

cve-icon Vulnrichment

Updated: 2026-09-18T14:56:37.890Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-18T12:17:30.667

Modified: 2026-10-15T17:17:30.010

Link: CVE-2026-93488

cve-icon Redhat

Severity : Important

Publid Date: 2026-09-10T00:39:48Z

Links: CVE-2026-93488 - Bugzilla